Pirn for use in the shuttles of looms for weaving



April 1934- w. A. DICKIE ET AL 1,954,071

PIRN FOR USE IN THE SHUTTLES OF LOOMS FOR WEAVING Filed Aug. 10, 1928FIG l WILLIAM A. DICKIE LEONARD IATHAM THOMAS H. PLAT Inve rs AttorneysPatented Apr. 10, 1934 UNITED STATES PATENT OFFICE PIRN FOR USE IN THESHUTTLES OF LOOMS FOR WEAVING Application August 10, 1928, Serial No.298,666 In Great Britain September 28, 1927 3 Claims. (01. 1s9-213) Thisinvention relates to pirns and more especially to pirns for use in loomsemploying automatic pirn changing devices.

Various methods have been employed for controlling the tension or dragon the yarn being drawn from pirns in weaving. For instance, undernon-automatic conditions of Weaving (i. e. weaving with looms notprovided with automatic pirn changing devices) the drag or tension isusually controlled by controlling the ballooning of the yarn from thepirn by means of fur, or by tufting the eye of the shuttle or bybridles.

Generally however such methods of controlling the drag or tension areapplied in the shuttle and cause difficulty when it is attempted toemploy them when weaving with looms employing automatic pirn changingdevices. In such cases the furring or other means employed becomesdisturbed on changing a pirn, and, especially with smooth yarns such asartificial silks, there results a defective cloth of slack weft,strained weft, bad selvedges or other faults which generally arise fromtension inequality.

According to the present invention the nose of the pirn is formed orprovided with a tension controlling or balloon controlling devicecomprising a neck of circular cross section formed or provided withflanged or enlarged ends or shoulders and having a light ring floatingthereon between the flanges, ends or shoulders. The neck may if desiredbe formed in one with or be an integral part of the pirn, but we preferto fit a neck of brass or other suitable metal on to the nose of thepirn.

It will be understood that by varying the weight of the floating ringand the clearance between the floating ring and the neck the tension ofthe yarn may be varied and by these simple means the drag or tension maybe altered to suit the count of yarn or other conditions of weaving.

The annexed drawing shows by way of illustration one form of pirn inaccordance with the invention it being understood that these are givenonly by way of illustration and are in no way limitative.

Figure 1 is a view of the pirn, supposed as in the shuttle (not shown)in the operation of weaving and as travelling in the direction of thearrow.

Figure 2 is a section of the tension controlling device on the nose ofthe pirn. Referring to the drawing, the nose of the pirn l is fittedwith a cylindrical neck 2 formed with shoulders or flanges 3 and 4, andhaving a light ring 5 of circular cross-section floating loose thereonbetween the shoulders or flanges. The neck 2 and the floating ring 5 aremade of brass, steel or other suitable metal.

The neck 2 is formed in two parts, an upper part 6 and a lower part '7adapted to be screwed together in the manner shown. This constructionfacilitates the mounting of the floating ring 5 on the neck 2 andreadily enables the ring 5 to be changed for a ring of different size orweight.

The neck 2 is mounted on to the nose of the 5 pirn by means of the screw8 formed with the lower part 7 of the neck 2. Instead of beingcylindrical, the neck 2 may have any other shape of circular crosssection, for instance, the neck may be concave or inwardly curved, theends of 7 the curve forming shoulders.

The yarn 10 balloons in passing from the yarn package 11 to the ring 5,passes under the ring 5 and forms a second balloon in passing to thenext point of support (not shown) e. g. an eye in the 7 shuttle. Whenthe pirn is travelling in the direction of the arrow the ring 5 isthrown up towards the flange or shoulder 3 and when the pirn istravelling in the opposite direction the ring 5 is thrown down towardsthe flange or shoulder 4. so

The tension of the yarn may be varied according to the weight of thering 5 and the clearance between the ring 5 and the neck 2, andaccording to the chamfering of the shoulders or flanges 3 and 4. 5

As the tension controlling device is fitted to or formed with the pirnitself and the necessity for fitting tension controlling devices to theshuttle itself is avoided, the pirn of the invention is of great use inweaving with looms provided with automatic pirn changing devices, as thetension conditions can be arranged or provided for beforehand on thepirn in the magazine of the loom and similar tension conditions can bearranged or provided for on a number of such pirns in the magazine ofthe loom.

When weaving with looms employing automatic pirn changing devices theyarn may be threaded under the ring 5 previous to filling up themagazine and similar conditions of tension may be provided for on anumber of such pirns before they leave the magazine.

If desired the pirn of the invention may be employed in self threadingtypes of shuttle.

What we claim and desire to secure by Letters Patent isz- 1. A pirn foruse in loom shuttles provided with a tension-controlling devicecomprising a neck of circular cross-section forming a continuation ofthe small end of the pirn tube, and provided with no enlarged ends, anda ring of circular cross-section freely mounted on said neck betweensaid enlargements and adapted when the pirn is working in a shuttle tomove horizontally under the frictional action of the yarn passingthrough it, and to nip the yarn against the enlarged portion of theneck, so as to impart a controlled tension to the yarn leaving the pirn.

2. A pirn for use in loom shuttles provided with a tension-controllingdevice comprising a neck of circular cross-section forming acontinuation of the small end of the pirn tube, said neck curvinginwardly from its ends, and a light ring of circular cross-sectionfreely mounted on said neck and adapted when the pirn is working inashut: tle to move horizontally under the frictional action of the yarnpassing through it, and to nip the yarn against the enlarged portion ofthe neck, so as to impart a controlled tension to the yarn leaving thepirn.

3. A pirn for use in loom shuttles provided with a tension-controllingdevice comprising a neck of circular cross-section forming acontinuation of the small end of the pirn tube, said neck beingconstituted by two parts secured together and curving inwardly to thepoint of connection, and a light ring of circular cross-section freelymounted on said neck and adapted when the pirn is working in a shuttleto move horizontally under the frictional action of the yarn passingthrough it, and to nip the yarn against the enlarged portion of theneck, so as to impart a controlled tension to the yarn leaving the pirn.

WILLIAM ALEXANDER DICKIE.

LEONARD LATHAM.

THOMAS HEWITT PLATTS.

